Know2eat

Phosphatidylserine

Fatty Acids & Oils

What phosphatidylserine may help with

Ranked by how strong the human evidence is — best supported first.

Best supportedCognitive functionLimited evidence· 4 sources

Then, in order

4 things to know first — allergies, interactions and limits

About Phosphatidylserine

A phospholipid concentrated in the inner leaflet of neuronal cell membranes. Supplements were originally extracted from bovine brain cortex and are now almost entirely made from soy or sunflower lecithin.

Phosphatidylserine has an unusual regulatory history that tells the story better than any summary: the FDA permitted a qualified health claim for cognitive decline while stating in the same document that there is little scientific evidence supporting it. The trials that generated the original enthusiasm in the late 1980s used bovine-cortex-derived phosphatidylserine, which was withdrawn over transmissible spongiform encephalopathy concerns. The plant-derived material that replaced it has a different fatty-acid composition and has performed less well, so the modern product is not the one the classic studies tested.

Sold as
Capsule, Softgel, Powder, Combined with omega-3
Standardised to
mg phosphatidylserine per serving; soy- or sunflower-derived unless stated otherwise — a product without this marker may not resemble what was studied.
Also known as
PS, Soy phosphatidylserine, Bovine cortex PS

Regulation: The FDA permits two qualified health claims for phosphatidylserine and cognitive dysfunction or dementia in the elderly, both of which must be accompanied by the statement that the agency concludes there is little scientific evidence supporting the claim. Bovine-derived phosphatidylserine was removed from the market over BSE risk.

What the research used

The amounts, forms and durations published trials of Phosphatidylserine actually administered.

These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.

  • Studied for Cognitive trials in older adults

    300 mg

    Limited

    Phosphatidylserine daily, usually 100 mg three times · 3–6 months

    The classic dose, from trials using bovine cortex material that is no longer sold. Soy-derived phosphatidylserine at the same dose has produced smaller and less consistent results.

  • Studied for Exercise stress and cortisol

    400–800 mg

    Limited

    Phosphatidylserine daily · 10 days to 6 weeks

    Small trials in athletes reported blunted cortisol responses to intense exercise. Sample sizes are in the tens and several were supported by the ingredient manufacturer.

This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

None of the timings below were directly compared in a trial. They reflect how the research happened to dose, or what the pharmacology implies — which is not the same as a timing being better.

  • Split through the day

    Not enough

    Trials dosed 100 mg three times a day rather than as a single dose. That reflects trial design rather than a tested comparison — nobody has run the head-to-head.

    Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

The evidence in depth

Best supported: Limited

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.

Cognitive function

Brain & Cognitive Health
Limited evidence

Trials in older adults with memory complaints report modest improvements on some memory measures, most clearly with the bovine-derived material that is no longer available. Soy-derived phosphatidylserine has produced weaker results, and the FDA describes the supporting evidence as limited when permitting the claim.

What may be going on: Phosphatidylserine is a structural phospholipid of neuronal membranes and a cofactor for several membrane-bound signalling enzymes. Whether oral supplementation changes brain phosphatidylserine content in humans is not established.

Limited evidence. Early human work, or mostly lab and animal research.

View the 4 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Stress and anxiety

Mental Wellbeing
Limited evidence

Small trials report blunted cortisol responses to exercise or acute mental stress. The studies are small, the endpoint is a hormone rather than how anyone felt, and independent replication is sparse.

Limited evidence. Early human work, or mostly lab and animal research.

View the 2 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Exercise performance

Muscle & Physical Performance
Not enough evidence

A handful of small trials have looked at phosphatidylserine and endurance or golf accuracy with inconsistent results. There is not enough human research to support a performance claim.

Not enough evidence. Not enough human research to say anything useful yet.

View the 1 source

Deep research mode adds each paper’s own conclusion and stated limitations.

Things to know

Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.

  • Interaction

    Additive effects with anticholinergic and cholinergic drugs

    Interacts withDonepezil, rivastigmine, galantamine, anticholinergic drugs

    Phosphatidylserine has been reported to interact with cholinergic medication used in dementia, and combining it with acetylcholinesterase inhibitors is usually flagged for prescriber review.

  • Interaction

    Possible additive effect with blood thinners

    Interacts withWarfarin, direct oral anticoagulants, antiplatelet drugs

    Phospholipid supplements have been reported to affect platelet function, and phosphatidylserine specifically is often flagged alongside anticoagulant and antiplatelet therapy.

  • Allergy

    Soy source

    Most products are derived from soy lecithin. Highly processed lecithin contains little residual protein, but sunflower-derived alternatives exist for anyone with a soy allergy.

  • Worth knowing

    The studied material is not the material sold

    The most positive trials used bovine cortex phosphatidylserine, withdrawn over prion transmission concerns. Transferring those results to a soy-derived product is an assumption, not a finding.

Evidence ratings on this page: 2 limited evidence, 1 not enough evidence.

Supplements are sold in the US without pre-market review of efficacy or safety. Nothing on this page is a recommendation to take Phosphatidylserine, or a dose to follow.